I've just installed RC1 on a different machine with a Freecom USB DVB-T stick and tested, and the problem is exactly the same. A file gets created, then deleted, and repeat. Logs from quick test attached.
Edit to add:
I've also noticed I can't watch live TV, an unexpected error occurs, but if I open the TV Server config and start timeshifting, I can quite happily watch the resultant stream that is created in the timeshift folder.